DOI: 10.1016/j.atmosenv.2017.07.030
Scopus记录号: 2-s2.0-85025144351
论文题名: Variations of aerosol size distribution, chemical composition and optical properties from roadside to ambient environment: A case study in Hong Kong, China
作者: Zhang Q ; , Ning Z ; , Shen Z ; , Li G ; , Zhang J ; , Lei Y ; , Xu H ; , Sun J ; , Zhang L ; , Westerdahl D ; , Gali N ; K ; , Gong X
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 166 起始页码: 234
结束页码: 243
语种: 英语
英文关键词: Aerosol size distribution
; Black carbon coating
; Chemical composition
; Light absorption
; Particle-bound PAHs
Scopus关键词: Aerosols
; Aromatic hydrocarbons
; Electromagnetic wave absorption
; Light absorption
; Organic carbon
; Particle size analysis
; Polycyclic aromatic hydrocarbons
; Roadsides
; Size distribution
; Absorbing properties
; Aerosol light absorption
; Aerosol size distributions
; Anthropogenic chemicals
; Black carbon
; Chemical compositions
; Secondary inorganic aerosol
; Secondary organic aerosols
; Optical properties
; ammonia
; black carbon
; brown carbon
; carbon
; element
; inorganic compound
; nitrate
; organic carbon
; polycyclic aromatic hydrocarbon
; sulfate
; unclassified drug
; absorption
; aerosol composition
; black carbon
; chemical composition
; coagulation
; coating
; condensation
; optical property
; PAH
; particle size
; particulate matter
; physicochemical property
; roadside environment
; size distribution
; traffic emission
; aerosol
; aging
; ambient air
; anthropology
; Article
; atmospheric dispersion
; chemical composition
; chemical reaction
; concentration (parameters)
; exhaust gas
; Hong Kong
; optics
; particle size
; particulate matter
; physical chemistry
; population distribution
; priority journal
; secondary organic aerosol
; ultraviolet radiation
; ultraviolet spectroscopy
; urban area
; China
; Hong Kong
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: This study investigated the “roadside-to-ambient” evolution of particle physicochemical and optical properties in typical urban atmospheres of Hong Kong through collection of chemically-resolved PM2.5 data and PM2.5 size distribution at a roadside and an ambient site. Roadside particle size distribution showed typical peaks in the nuclei mode (30–40 nm) while ambient measurements peaked in the Aitken mode (50–70 nm), revealing possible condensation and coagulation growth of freshly emitted particles during aging processes. Much higher levels of anthropogenic chemical components, i.e. nitrate, sulfate, ammonium, organic carbon (OC) and elemental carbon (EC), but lower levels of OC/EC and secondary inorganic aerosols (SIA)/EC ratios appeared in roadside than ambient particles. The high OC/EC and SIA/EC ratios in ambient particles implied high contributions from secondary aerosols. Black carbon (BC), a strong light absorbing material, showed large variations in optical properties when mixed with other inorganic and organic components. Particle-bound polycyclic aromatic hydrocarbons (p-PAHs), an indicator of brown carbon (BrC), showed significant UV-absorbing ability. The average BC and p-PAHs concentrations were 3.8 and 87.6 ng m−3, respectively, at the roadside, but were only 1.5 and 18.1 ng m−3 at the ambient site, suggesting BC and p-PAHs concentrations heavily driven by traffic emissions. In contrast, PM2.5 UV light absorption coefficients (babs-BrC,370nm) at the ambient site (4.2 Mm−1) and at the roadside site (4.1 Mm−1) were similar, emphasizing that particle aging processes enhanced UV light-absorbing properties, a conclusion that was also supported by the finding that the Absorption Ångström coefficient (AAC) value at UV wavelengths (AAC_UV band) at the ambient site were ∼1.7 times higher than that at the roadside. Both aqueous reaction and photochemically produced secondary organic aerosol (SOA) for ambient aerosols contributed to the peak values of babs-BrC,370nm in ambient particles at midnight and around noon, highlighting that secondary BrC had different sources and particle aging in the atmosphere affected BrC and BC properties and related aerosol light absorption. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82552
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an, China; School of Energy and Environment, City University of Hong Kong, Hong Kong, Hong Kong; Guy Carpenter Asia-Pacific Climate Impact Centre, City University of Hong Kong, China; Air Quality Research Division, Science and Technology Branch, Environment and Climate Change Canada, Toronto, Canada
Recommended Citation:
Zhang Q,, Ning Z,, Shen Z,et al. Variations of aerosol size distribution, chemical composition and optical properties from roadside to ambient environment: A case study in Hong Kong, China[J]. Atmospheric Environment,2017-01-01,166